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| Number | Title | Issue Date |
| 8066064 | Well assembly having a casing hanger supported by a load member actuated by a retractable member disposed in the wellhead A wellhead system comprising a high pressure housing having a retractable ring and a casing hanger having an activation ring configured to be engaged by the retractable ring when the casing hanger is lowered into the high pressure housing. An expandable load member ... | 11/29/2011 |
| 8061419 | Casing head slip lock connection for high temperature service A wellhead connection for connecting and sealing to a casing, including an upper head housing accommodating the upper end of the casing in its central bore, a stop shoulder in the central bore to allow the upper head housing to rest on the upper end of the casing, a... | 11/22/2011 |
| 7357185 | Subsea tubing hanger assembly for an oil or gas well A subsea tubing hanger assembly is disclosed which comprises a tubing hanger (12) having a plurality of conduits (14). A pup joint (16) is connected to the hanger (12) and a shroud (20) surrounds the pup joint (16). A plural... | 04/15/2008 |
| 7308943 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree in which a tubing hanger is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including access to the producti... | 12/18/2007 |
| 7296631 | System and method for low-pressure well completion A low-pressure wellhead system with tubular heads and mandrels secured independently using threaded unions. A casing mandrel is secured to a wellhead by a first threaded union. Likewise, a tubing head spool is secured to the casing mandrel using a threaded union. A ... | 11/20/2007 |
| 7159663 | Hybrid wellhead system and method of use A hybrid wellhead system is assembled using a plurality of threaded unions, such as spanner nuts or hammer unions, for securing respective tubular heads and a flanged connection for securing a flow control stack to a top of a tubing head spool. The tubing head spool... | 01/09/2007 |
| 7025133 | Multiple bore christmas tree outlet A large bore Christmas tree includes a production outlet that is split into multiple separate outlets, each controlled by a separate, standard sized valve and valve actuator. ... | 04/11/2006 |
| 6966383 | Horizontal spool tree with improved porting The horizontal spool tree assembly 10 controls fluid flow through a production tubing string 18 within a well. The horizontal spool tree assembly is adapted for use with a workover string for fluid communication with the tree assembly. The spool body | 11/22/2005 |
| 6834718 | Casing head connector with landing base A connector head, for transferring at least a portion of the load from an inner tubular body onto an outer tubular body, comprises a generally tubular connector head formed with a central bore through which the inner tubular body extends. The connector head has an i... | 12/28/2004 |
| 6763882 | Insulated casing and tubing hangers In order to prevent potential electrical hazards associated with supplying power downhole, a hanger is provided for either casing or tubing strings, or a plurality of casing or tubing strings, that electrically insulates the internal suspension mechanism of the hang... | 07/20/2004 |
| 6675900 | Crossover tree system A subterranean oil or gas well apparatus is provided. The apparatus includes a single-bore production tubing hanger arranged concentric with a wellhead. The tubing hanger includes a plurality of ports and channels arranged about the tubing hanger to give ... | 01/13/2004 |
| 6588510 | Coil tubing hanger system A coil tubing hanger system and a method of installing such system is provided. The coil tubing hanger system comprises a body having an axial opening there through. A slip bowl having a base and housing a slip that can be retained in a first position spa... | 07/08/2003 |
| 6516876 | Running tool for soft landing a tubing hanger in a wellhead housing A running tool for a wellhead has an outer sleeve, a piston, an inner sleeve, each with respective hydraulic chambers, and a pair of collets for engaging a tubing hanger in a wellhead. Pressure is applied to the various chambers to actuate the collets and... | 02/11/2003 |
| 6378613 | Large bore subsea Christmas tree and tubing hanger system A concentric tubing hanger having a radially offset tubing annulus passage closeable by a remotely operable valve, preferably a pressure balanced, hydraulically-operated shuttle valve positioned at an upper end of the tubing annulus passage. The tubing ha... | 04/30/2002 |
| 6015009 | Casing and tubing hanger system A hanger system for supporting production casing and coiled tubing in a surface pipe has a casing head supported on the surface pipe and has a vertical opening therethrough with an internal circumferential load shoulder. A casing hanger is supported withi... | 01/18/2000 |
| 5813470 | Means for relieving load on stacked casing hangers Using additional load shoulders on wellhead casing hangers when multiple casing hangers are needed increases the capacity of the casing hangers to withstand loads. The shoulders of the casing hangers are not required to land simultaneously. Either the upp... | 09/29/1998 |
| 4582132 | Wellhead expansion assembly A wellhead expansion assembly for wells having a plurality of tubes carrying hot fluids into and out of a well. Thermal expansion of the tubing is a accommodated by provision of an expansion chamber for termination of each separate string of tubing. Expan... | 04/15/1986 |
